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g- 1929- M. B. BEHRMAN BILADE -AND HOLDER THEREFOR Original Filed Oct. 3, 1924 mam 22'" INVENTOR Patented Aug. 20, 1929.

UNITED STATES PATENT OFFICE.

MARUU S B. IBEHRMALL OF NEW YORK, N. Y., ASSIGNOR TO THE LOX SEAL CORIPORA- TION, OF BROOKLYN, NEW YORK, A CORPORATION OF NEW YORK.

BLADE AND HOLDER THEREFOR.

Application filed October 3, 1924, Serial No. 741,402. Renewed January 6, 1927.

My present invention relates generally to a blade and holder therefor, and more particularly to a detachable association therebetween.

While in the present application, I illustrate 5 my invention and describe it as employed for a surgeons knife, and will so hereinafter refer to it, it will be understood that this is done merely for purposes of convenience and that my invention can be employed for cutting instruments other than the specific embodiments herein illustrated and described.

I have found that in instruments of this character, it is desirable not only that the knife blade be readily disassociated from the handle or holder for purposes of sharpening,

replacement and sterilizing, but that the manner of associating of the blade'with the handle shall be such that the knife and the blade shall be firmly secured, one to the other, so that in use, the possibility of accidental movement of the knife with reference to the handle shall be reduced to an absolute minimum,

One of the objects of my invention there fore is an arrangement whereby the means for securing the blade to the handle shall be of such character as to eliminate to a great extent any possibility of any accidental movement of the blade with reference to the handle or any possibility.of any accidental operation of the locking parts which will render the holding means ineffective.

I have found that, where a holding means of this character are dependent upon the flexing of the blade, there is always the possibility of the user injuring himself because of the fact that the blade which is provided with an extremely sharp edge, must be gripped firmly so as to produce the proper flex therein, and that therefore in this operation, great care is required.

I have also found that the blade necessary for the purposes intended should be relatively thin and therefore extremely flexible and another one of the objects of my invention is to provide an unyielding support for a substantial portion of the blade so as to reduce the flex of the blade without reducing the length of the cutting edge.

For the attainment of these objects and such other objects as may hereinafter be pointed out, I have illustrated embodiments of my invention in the drawings, wherein- Fig. 1 is a perspective view of one embodiment of my invention with the blade in operative association to the holder,

Fig. 2 is an enlarged top plan view-thereof with the ends broken away;

Fig. 3 is a longitudinal vertical section taken on line 38 of Fig. 2;

Fig. 4c is a View similar to Fig. 2, showing a modified embodiment;

Fig. 5 is a view similar to Fig. 2 of another embodiment; and

Fig. 6 is a view similar to Fig. 2 of a fourth embodiment.

Upon viewing Fig. 1 of the drawing, it will be observed that I here show a surgical knife comprising a holder and a blade 11 removably associated therewith. The holder consists of the handle or handgrip 10 and the blade support projecting from one end thereof, this blade support 12 being preferably in the form of a channeled member having side-walls 13 and 14 projecting upwardly therefrom and having its front end 15 inclined as clearly shown in Fig. 2 of the drawing.

The support 12 is provided preferably along the central longitudinal line thereof with a cylindrical pin 16 mounted for rotation therein, but held against separation therefrom in any preferred or desired manner as by upsetting the lower end of the pin over the ring washer 16 secured in the widened part of the aperture through the base 12, and attached to the upper end of the pin is the locking member 17 preferably in the form of an elongated member or cross-piece positioned symmetrically with reference to the pin 16 and of a thickness substantially less than that of the pin.

Upon viewing Fig. 3 of the drawing, it will be observed that the crosspiece 17 is attached to the pin at a point, a substantial distance above the top of the base 12, thus providing a space between the lower surface of the member 17 and the upper surface of the base 12, the function of which will be understood shortly.

The knife blade 11 of any preferred or desired shape is provided with a cutting edge 18 and is so contoured and dimensioned as to be received on the base 12 between the upstanding walls 13 and 14 and is provided with a slot cut therethrough, which slot at its central portion 20 is made circular as shown so as to receive the pin 16 for rotation therein, the portions of the slot 21 and 22 extending to both sides thereof, being of a shape so as to freely receive the ends of the member 17 when theslot and the bar are in registry so as to direction in its own plane, that is toward the permit the slot to be passed over the pin and the bar. In other words, the shape and dimensions of the slot and of the member 17 substantially are alike.

To further assist in holding the knife in position, I preferably undercut the holder at 23 adjacent to the junction between the handle 10 and the base member 12.

From the description thus far given, it will be understood that when the pin 16 is retated so as to position the bar 17 longitudinally thereover, that the knife can then be positioned on the base between the side-walls 13 and 1% because the slot 20, 21, 22 will be in registry with the bar 17, and the bar 17 will pass through the slot in the knife and the central circular portion of the slot will position itself over the pin, it being understood that the rear end of the blade is first inserted into the undercut 23. \Vhen the bar 17 is thus rotated to a position at an angle to the slot, for instance, at right angles as shown in Fig. 2, the knife will be locked in position between the base 12 and the bar.

By the arrangement thus far described, it will be understood that the blade is held against the movement in any direction in its own plane by means of the pin 16 and additionally against the movementin a backward butt end of the handle by the rear wall of the undercut 23 and that the blade is held against movement in its own plane additionally in a direction transversely of the handle by means of the walls 13 and 14; and that itis held against movement upwardly or directly away from the base 12 by means of the upper wall of the undercut portion 23 as well as by the lock 17.

It is preferable that thecutting edge 18 ot' the blade be positioned adjacent the wall 14,

since in this position due to the incline of the wall 15, we obtain on the one hand, full freedom of action for the cutting edge 18 and on the other hand, obtain additional support for the opposite or unsharpened edge of the blade.

In Fig. 4 of the drawing, I show a modified form of blade securing means in which the part 22 of the slot in the blade is extended or lengthened, thereby making it longer than the part 21' and in which the bar 17 is also lengthened at one end and to the same extent. As a result of this arrangement, the lock 17 of Fig. 4 is in complete registry with the slot 20, 21, 22, only at one point in its with the slot 20 21', 22' provided the longer arm of the member 17 is immediately above the shorter end 21 of the slot. This last form has the advantages that on the one hand, it has only one position of release and on the other hand, when the member 17 is in a posi tion parallel with the slot, but at 180 removed from such position of release, the extension of the arm 17 referred to naturally acts as an upper or abutting member for the upper surface of the blade or knife and therefore gives the knife holding means a wider area of elfectiveness.

The embodiment of Fig. 5 differs from that v of Fig. 4 in that the extended slot 22 is pointed at its end as shown at 30 whereas end 21 is similar to end 21 and the correspondingly lengthened part of .the member 17 is also correspondingly pointed as shown at 31.

In the embodiment of Fig. 6, I show the portion of the slot 22 as extended allthe way to the rear end of the blade so as to make the slot an open one and in this embodiment, the extended part of the member 22 may, if desired, be correspondingly lengthened so as to give the advantages of the embodiment in Fig. 4, even to a still further degree. It will be understood, however, that the length of the member 17 may be spch as to fall short of the full length of the s ot.

Having thus described my invention and illustrated its use what I claim as new and desire to secure by Letters Patent is In a device of the character described, a holder comprising a handle member, and a knife blade to be detachabl I mounted thereon and means for securing t e two in detach-- able association, said means comprising a pin projecting upwardly from the holder and pivotally secured therein and of a length substantially equal to the combined thicknesses of the holder and blade at the point of assembly and a locking member mounted on the pin, said locking memberbeing less in width than the diameter of the pin, portions of the locking member extending in opposite directions beyond the pin to dilferent extents the knife blade being provided with a slot therethrough, the intermediate portion of which is substantially circularand of a diameter to freely receive the pin therethrough,

and the end portions of which are of d-ifierent lengths, narrower than the diameter of the pin and of a character and dimensions so as to permit the locking member to pass therethrough when in registry therewith,

whereby when the locking member is not in registry with the slot, the knife blade will be locked to the holder and when in a position in which it is in registry therewith, the knife blade can be removed from the holder.

In witness whereof, I have signed my name. I

MARCUS B. BEHRMAN. 

